Abstract:

Air cooled chillers having a condenser section (300) sized to match
chiller capacity and auxiliary cooling requirements satisfied by use of
an independent cooling coil (314) dedicated to providing auxiliary
cooling. The independent cooling coil (314) is located within the current
condenser (300), but utilizes available space within the existing
condenser, as well as a small portion of the airflow driven by the
existing condenser fan (320). Thus, the auxiliary cooling capacity is
provided with a single dedicated coil design, but which otherwise uses
existing equipment and space.

Claims:

1. In a cooling system wherein cooling is provided by a vapor compression
system having an outdoor unit, the outdoor unit comprises a condenser to
receive refrigerant vapor from a compressor of the vapor compression
system and a cooling coil structurally independent of the condenser to
receive a fluid from an auxiliary circuit, the auxiliary circuit
comprising a heat transfer device in communication with a portion of the
vapor compression system requiring cooling, and the auxiliary circuit
circulates the fluid from the heat transfer device to the cooling coil,
heat being absorbed by the fluid from the heat transfer device, and
removed from the fluid by airflow through the cooling coil.

2. An air-cooled condenser comprising:a first coil forming a portion of a
first loop circulating a first fluid;a second coil independent from the
first coil and forming a portion of a second loop circulating a second
fluid;wherein the first loop is adapted for connection to a compressor
and circulates the first fluid from the compressor to the first coil;
andwherein the second loop is adapted for connection to a heat transfer
device and circulates the second fluid from the heat transfer device to
the second coil.

3. The air-cooled condenser of claim 2 further comprising a fan to
circulate air through the first coil and the second coil.

4. The air-cooled condenser of claim 3 wherein the second coil is
positioned near the fan.

5. The air-cooled condenser of claim 4 wherein the second coil has a
substantially vertical orientation to enable substantially horizontal
airflow through the second coil.

6. The air-cooled condenser of claim 4 wherein the second coil has a
substantially horizontal orientation to enable substantially vertical
airflow through the second coil.

7. The air-cooled condenser of claim 3 wherein the second coil is
positioned opposite to the fan.

8. The air-cooled condenser of claim 7 wherein the second coil has a
substantially horizontal orientation to enable substantially vertical
airflow through the second coil.

9. The air-cooled condenser of claim 7 wherein the first coil comprises a
pair of first coils, the second coil comprises a pair of second coils,
each second coil of the pair of second coils is structurally independent
from the pair of first coils and is positioned below a corresponding
first coil to form a coil slab, and the corresponding pair of coil slabs
are positioned to form a V-shaped geometry.

10. An air-cooled condenser, comprising:a plurality of sections, each
section of the plurality of sections comprising a first coil forming a
portion of a first loop circulating a first fluid and a fan to circulate
air through the first coil;one section of the plurality of sections being
a first section comprising a second coil, the second coil being
independent of the corresponding first coil and forming a portion of a
second loop circulating a second fluid, and the corresponding fan of the
section being positioned to circulate air through the second coil;wherein
the first loop being adapted for connection to a compressor and the first
loop being configured to circulate the first fluid from the compressor to
the first coil; andwherein the second loop being adapted for connection
to a heat transfer device and the second loop being configured to
circulate the second fluid from the heat transfer device to the second
coil.

11. The air-cooled condenser of claim 10 wherein the second coil is
structurally independent of the first coil.

12. The air-cooled condenser of claim 10 wherein another section of the
plurality of sections different from the one section of the plurality of
sections being a second section, the second section comprises a third
coil, the third coil being independent of the corresponding first coil
and forming a portion of the second loop, and the third coil being in
fluid communication with the second coil.

13. The air-cooled condenser of claim 10 wherein the first coil of each
section of the plurality of sections comprises a pair of coils, the pair
of coils being positioned at an angle, and the second coil being
positioned between the pair of coils.

14. The air-cooled condenser of claim 13 wherein the second coil has a
substantially vertical orientation to enable substantially horizontal
airflow through the second coil.

15. The air-cooled condenser of claim 10 wherein another section of the
plurality of sections different from the one section of the plurality of
sections is a second section, the second section comprises a third coil,
the third coil being independent of the corresponding first coil and
forming a portion of a third loop circulating a third fluid, the third
loop being independent of the second loop, wherein the third loop being
adapted for connection to a second heat transfer device and the third
loop being configured to circulate the third fluid from the second heat
transfer device to the third coil.

16. The air-cooled condenser of claim 13 wherein the second coil has a
substantially horizontal orientation to enable substantially vertical
airflow through the second coil.

17. An air-cooled condenser comprising:a cabinet;a condenser coil
positioned in the cabinet, the condenser coil being part of a first
circuit circulating a refrigerant fluid;an auxiliary cooling coil
structurally independent of the condenser coil, the auxiliary cooling
coil being positioned in the cabinet and being part of a second circuit
circulating a second fluid;the condenser coil and the auxiliary cooling
coil having independent inlets and outlets; andat least one fan
positioned in the cabinet to circulate air through both the condenser
coil and the auxiliary cooling coil.

[0002]The application generally relates to auxiliary cooling systems used
with air-cooled condensers located outside of the building being cooled
to provide auxiliary cooling for specialized heat generating functions
not adequately served by the air conditioning system.

[0003]Certain components in cooling systems that are not in the
conditioned space also require cooling. For example, electrical
components associated with the electronic controls of a heating,
ventilation and air conditioning system may generate significant heat as
a result of operations. These components are usually housed in a separate
enclosure or cabinet that isolates the components from the atmosphere.
However, the enclosure is generally weatherproof with minimal
ventilation, so a substantial buildup of heat also occurs in the
enclosure or cabinet as power electronic semiconductor components in the
cabinet generate a large amount of heat during operation. It is necessary
to remove this heat in order to avoid a rise in temperatures that could
either destroy the electronic semiconductor components or threaten proper
operation of the electronic semiconductor components. The process of
removing heat from such auxiliary components is referred to as auxiliary
cooling. Auxiliary cooling is also utilized in certain vapor compression
systems that utilize an oil separator installed at the outlet of the
compressor to separate refrigerant and oil. The oil is returned from the
oil separator to the compressor. In certain applications, the temperature
of the oil leaving the oil separator is sufficiently elevated that
cooling is required before it is returned to the compressor for proper
operation of the system. Cooling of the oil also is provided by an
auxiliary cooling system.

[0004]For cooling systems utilizing air-cooled condensers located outside
of the building, such as on a rooftop, auxiliary cooling conveniently may
be provided by ambient air. However, auxiliary cooling may be provided by
refrigerant or chilled water. In these designs, excess heat is
transferred from an enclosure by means of a heat transfer device, such as
a heat transfer device, and depending on the design, directly from the
electronic components to the heat transfer device, the heat transfer
device comprising a material having high thermal conductivity, the heat
transfer device further including cooling channels that constitute a
portion of the heat transfer loop that circulates a fluid to remove heat
from the cabinet and from the electrical components. The fluid contacting
the heat transfer device removes thermal energy from the heat transfer
device. This heat then must be removed from the flowing fluid.

[0005]An effective apparatus and method for providing auxiliary cooling
without adversely affecting the cooling efficiency of the condenser is a
much sought-after improvement. Furthermore, such an apparatus and method
desirably provide auxiliary cooling within existing mechanical footprints
at low cost. Intended advantages of the systems and/or methods set forth
herein satisfy one or more of these needs or provide other advantageous
features. Other features and advantages will be made apparent from the
present specification. The teachings disclosed extend to those
embodiments that fall within the scope of the claims, regardless of
whether they accomplish one or more of the aforementioned needs.

SUMMARY

[0006]Air-cooled condensers are common in commercial cooling systems and
may utilize an air-cooled condenser as an outdoor unit. The condenser
section is sized to match cooling capacity of the system. Cooling is
provided by a vapor compression system utilizing a compressor
appropriately sized for the area to be cooled. Hot high pressure vapor
from a compressor discharge line is cycled to the condenser positioned in
the outdoor unit where it is cooled, condensed and cycled back to the
compressor. An auxiliary circuit includes an independent cooling coil
located in the outdoor unit combined with the condenser cooling coil. The
auxiliary circuit further includes a heat transfer device in
communication with a region requiring cooling, and a heat transfer loop
that circulates a fluid from the chill plate, which absorbs heat from the
region and transfers it to the fluid, to the independent cooling coil,
where heat is removed from the fluid in the outdoor unit The outdoor unit
includes an air-cooled condenser that comprises a first coil forming a
portion of a first loop for circulating a first fluid, a second coil
forming a portion of a second loop for circulating a second fluid wherein
the first loop is adapted for connection to a compressor and a compressor
discharge line for circulating the first fluid as hot high pressure vapor
from the compressor to the first coil, and wherein the second loop
includes a chill plate, and is adapted for connection to the chill plate
for circulating hot fluid from the chill plate to the second coil.

[0007]Alternative exemplary embodiments relate to other features and
combinations of features as may be generally recited hereinafter.

BRIEF DESCRIPTION OF THE FIGURES

[0008]FIG. 1 depicts a building having a cooling system utilizing a
condenser located in an outdoor unit on the rooftop.

[0009]FIG. 2 depicts a front view and side view of an embodiment of a
prior art condenser utilizing a condenser having condenser coils arranged
in a W configuration, a portion of the lower coils being used for
auxiliary cooling.

[0010]FIG. 3 depicts a front and side view of second embodiment of a
condenser showing an auxiliary cooling coil positioned within a modular
V-shaped condenser coil.

[0011]FIG. 4 depicts a side view of an embodiment of a condenser showing
auxiliary cooling coils positioned at the bottom of a V-shaped condenser
coil.

[0012]FIG. 5 depicts a side view of an embodiment of a condenser showing
an expanded cooling coil positioned within a V-shaped condenser coil.

[0013]FIG. 6 depicts a side view of an embodiment of a condenser showing a
horizontal auxiliary cooling system in the condenser cabinet.

[0014]FIG. 7 depicts a side view of an embodiment of a condenser showing a
V-shaped auxiliary cooling coil nested in a V-shaped condenser coil.

[0015]FIG. 8 is a more detailed view of FIG. 3B, depicting an auxiliary
cooling coil mounted adjacent the condenser coils and panel, and below
the condenser fan.

[0017]The present invention utilizes an independent cooling coil located
within the current condenser, but uses available space within the
existing condenser, as well as the airflow driven by an existing
condenser fan. Thus, the auxiliary cooling capacity of the present
invention is provided with a dedicated coil design independent of the
condenser loop, but which otherwise uses existing equipment and space.
Auxiliary cooling provided in this manner provides the advantage of being
added in a relatively simple manner. Since the additional auxiliary
cooling is provided within the framework of existing condensers,
requiring simple modification of existing condensers and not the redesign
of existing condensers to accommodate a dedicated auxiliary cooling
system. Another advantage of this dedicated independent coil design is
that while it is positioned within the existing condenser package and
makes use of existing fans, it does not decrease the condenser
efficiency. It thus becomes a cost-effective solution that also does not
substantially decrease condenser performance.

[0018]FIG. 1 depicts a building 100 having a cooling system utilizing a
condenser housed in an outdoor unit 120 positioned on the rooftop 101 of
building 100. In this building, the cooling system is provided by
individual cooling and air handling systems. Aor handling system 140
delivers conditioned air via supply and return ductwork 160, 170. Heating
and cooling is regulated by a temperature measuring device 125, such as a
thermostat located on each floor. Heating is centralized in a boiler 130
located in the basement of the building connected to the air handling
systems on each floor. The individual cooling systems on each floor are
connected to a condenser located in outdoor unit 120 that is positioned
on rooftop 101 of building 100.

[0019]FIG. 2a is an exploded perspective view of the outdoor unit 120 of
FIG. 1, which includes condenser 200. Condenser 200 includes coils
generally arranged in a W configuration. FIG. 2b is a front view and FIG.
2c is a side view of prior art condenser 200 of FIG. 2a. The condenser
utilizes four condenser coils arranged in a W configuration. Two outer
coils 210 are arranged in a substantially vertical orientation, while
inner coils 212 are arranged in a substantially inclined orientation. A
portion 214 of inclined inner coils is utilized for auxiliary cooling.
While any portion of inner coils 212 can be used to provide the auxiliary
cooling, the bottom of inner coils 212 is usually used for the auxiliary
cooling. The front view, FIG. 2b, depicts cooling coils 210, 212 with the
W configuration. The cooling coils include an upper circuit 216 dedicated
to condenser cooling and a bottom, shaded circuit, portion 214, dedicated
to auxiliary cooling. The cooling coils are not evident in the side view,
FIG. 2b the view of the coils blocked by panels 218 forming cabinets 224
and are better viewed in FIG. 2a. The auxiliary cooling circuit, portion
214, is not an independent coil, but rather is a separate circuit in coil
212. As shown, the length of condenser coils 210, 212 varies in
proportion to unit capacity and number of fans 220, and the length of the
auxiliary cooling circuit, portion 214, also varies in a similar manner.
Fans 220 draw cooling air in through louvers 222 or openings on panels
218 on sides of cabinets 224 that house cooling coils 210,212. Air drawn
in by fans 220 over coils 210, 212 is used as a heat exchange fluid to
remove heat from the fluid in the coils and reduce the temperature of the
fluid in the coils. Thus, air drawn in by existing fans 220 exchanges
heat from the fluid in the auxiliary cooling circuits which form lower
portion 214 of inner coil as well as in condenser circuits 210, 216. It
will be understood that the size of condenser 200 is matched to unit
capacity by varying the size of cooling coils 210, 212 in condenser 200,
and larger or smaller condensers may be used depending upon the unit
capacity. It will also be understood that auxiliary cooling circuits 214
can be positioned in any of the condenser coils, and that the length of
the condenser circuits 210, 216 can be varied to provide more or less
capacity.

[0020]FIG. 3 depicts the present invention an alternate embodiment of the
placement of an auxiliary cooling coil 314 within condenser 300. FIG. 3
depicts a front view and a side view of a condenser having cooling coils
310 with a V-shaped configuration. The cooling coils are arranged in a
slab. The V-shaped configuration in FIG. 3b results from a pair of slabs
being arranged in a V-shaped geometry. The coil configuration provides a
modular design. In the embodiment shown, the length of cooling coils 310
does not change. Instead, coils 310 are added or removed as additional
V-sections in proportion to unit capacity. In the configuration shown,
condenser coil 310 and the auxiliary coil 314 are independent
structurally, but share the same fan 320 that drives airflow through
both. Only the first condenser cooling coil 310 is evident in the front
view, the remainder of the condenser cooling coils 310 being positioned
behind the first condenser cooling coil. Independent auxiliary cooling
coil 314 is nested within the V-shaped geometry formed by condenser
cooling coils 310. The independent cooling coil is located within the
current condenser, but utilizes available space within the existing
condenser, as well as the airflow driven by an existing condenser fan.
Thus, the auxiliary cooling capacity is provided with a single dedicated
coil design, but which otherwise uses existing equipment and space. In
FIG. 3b, condenser 300 is subdivided into a plurality of sections 330,
each section 330 including a cooling coil having a V-shaped geometry,
with fans 320 located over each of section 330 to draw ambient air over
the coils to provide heat exchange. Sections 330 can be provided as part
of a modular design, allowing an increase or decrease in cooling capacity
by adding or removing sections 330 of the modular design. Auxiliary
cooling coils 314 also can be varied in capacity by modifying their size
and/or their number. The geometry of the cooling coils can also be varied
as desired, the configuration of the coils not being restricted to a
V-shaped geometry. FIG. 3b depicts a condenser having a single auxiliary
cooling coil 314, it being understood that each section 330 may include a
nested auxiliary cooling coil.

[0021]FIG. 4 is a side view of a variation of a condenser 400 depicted in
FIG. 3. Cooling coils 410 are arranged sectionally in a modular V-shaped
configuration, and each modular V-shaped section includes cooling coils
414 of an independent auxiliary cooling circuit adjacent to the condenser
cooling coils 410. Cooling coils 414 of the auxiliary cooling circuit are
positioned along the base of the V of the V-shaped configuration, with
cooling coils 410 of the condenser circuit arranged along the upper legs
of the V and over cooling coils 414 of the auxiliary cooling circuit.
Cooling coils 414 of the auxiliary cooling circuits can be connected in
series to provide additional auxiliary cooling as additional sections 430
are added. Alternatively, the auxiliary cooling circuits can be connected
independent of one another, with each of the auxiliary cooling circuits
being used to withdraw heat from different regions experiencing a heat
build-up, but each requiring the use of auxiliary cooling to remove heat.
The auxiliary cooling capacity also can be increased or decreased as
needed by connecting or disconnecting the auxiliary cooling circuits.
Interestingly, as noted, the auxiliary cooling capacity optionally can be
connected in series as needed, or can be channeled to provide dedicated
auxiliary cooling to various components, such as a circuit for oil
cooling and a circuit for cooling of variable speed drive (VSD) controls
that include temperature sensitive electronics and electrical components.
If all of the auxiliary cooling provided is not needed, auxiliary
circuits beyond what is required can be left unconnected so that no
cooling fluid passes through them. The operation of cooling fans 420 in
each of the sections draws ambient air used as a heat exchange fluid
simultaneously over both auxiliary cooling coils 414 and the condenser
cooling coils 410. While the position of cooling coils 414 of the
auxiliary cooling circuit may be at the base of the V-geometry, as shown,
cooling coils 414 of the auxiliary cooling circuit may be positioned
anywhere along the V-geometry, and condenser cooling coils 410 are
independent of cooling coils 414 of the auxiliary circuit, as the
condenser circuit is independent of any auxiliary circuits. The
embodiment shown utilizes a single V-shaped configuration and simplifies
design and manufacturing.

[0022]FIG. 5 is a variation of FIG. 4. The side view of FIG. 5 clearly
shows that coils 514 of auxiliary cooling circuit are located in a single
section of the condenser 500. In FIG. 5, coils 514 of the auxiliary
cooling circuit are located in the forward section of condenser 500,
although coils 514 of auxiliary cooling circuit are not restricted to a
single location. The embodiment of FIG. 5 shown differs from the previous
embodiment in that additional auxiliary cooling is provided by modifying
the size of cooling coils 514 of the auxiliary cooling circuit in the
V-portion of a section. Once again, it will be understood by those
skilled in the art that while coils 514 of the auxiliary cooling circuit
can be located in any of the sections of condenser 500 when condenser 500
includes more than one section 530, and the size or length of coils 514
of the auxiliary cooling circuit will vary depending upon the auxiliary
cooling requirements of the system. In the embodiment shown, the overall
manufacturing is complicated by the fact that at least two different
modular components are provided, one with coils 514 for an auxiliary
cooling circuit, and one or more without coils for an auxiliary cooling
circuit. Furthermore, modular components forming sections 530 with
different sized cooling coils 514 for the auxiliary cooling circuits may
be required, depending on the required auxiliary cooling capacity.

[0023]FIG. 6 provides a side view of an alternate embodiment of condenser
600 having an auxiliary cooling coil. In the embodiment shown, condenser
600 has a modular design that includes a plurality of V-shaped coils 610
in the condenser circuit. Cooling coil 614 of the auxiliary cooling
circuit is an independent coil, which is positioned adjacent to the
V-shaped cooling coils 610, coils 614 shown in a substantially horizontal
position. The position of cooling coil 614 of auxiliary circuit is not
limited to a substantially horizontal position, and may assume any
angular position with respect to the V-shaped coil. Also, the geometry of
cooling coil 614 of auxiliary cooling circuit may vary so that coil 610
may assume any shape. The embodiment shown, like previous embodiments,
also does not require a separate cooling fan for auxiliary cooling coil
614, but utilizes existing condenser cooling fans 620 as the source of
cooling fluid for heat exchange. When condenser 600 includes a plurality
of sections 630, auxiliary cooling coil 614 can be positioned adjacent
and within the V geometry of any of coils 610. In the embodiment shown,
condenser 600 includes a plurality of sections 630, but the section, here
section 632 that houses auxiliary cooling coil 614 has a condenser
cooling coil 610 that has a slightly different geometry than other
V-coils in the condenser 600. In the embodiment shown, coils 614 of the
auxiliary cooling circuit may be positioned substantially horizontally,
within coils 610 of the first or last of arranged sections 632.

[0024]FIG. 7 depicts a side view of an alternate embodiment of the
auxiliary cooling system of the present invention. Condenser 700 includes
a plurality of sections 730, each section including condenser cooling
coils 710, and a fan 720. One section further includes auxiliary cooling
coils 714. Condenser cooling coils 710 and auxiliary cooling coils 714
are independent of each other. Condenser cooling coils 710 are arranged
as discussed tohave a substantially V-shaped geometry, when viewed from
the side. As depicted, auxiliary cooling coil 714 may be nested with
respect to condenser cooling coils 710. The geometry of auxiliary cooling
coil 714 is such that it can nest within the substantially V-shaped
geometry of condenser cooling coils 710. Nesting may require a
modification or variation of the geometry of condenser coils 710 when
housed with auxiliary cooling coils 714 such as shown in section 732. The
auxiliary cooling coils 714 may be of any geometry that nests within the
geometry of condenser cooling coils 710 while allowing cooling air to be
circulated over both condenser cooling coils 710 and the auxiliary
cooling coil 714. The embodiment shown also permits auxiliary coil 714 to
take advantage of the cooling provided by existing fan(s) 720, but does
require design and incorporation into condenser 700 of a separate fan for
auxiliary cooling coil 714. Although auxiliary cooling coil 714 is
depicted in a nested position of condenser cooling coil 710 and located
in the forward section of condenser 700, it will be understood by those
skilled in the art that auxiliary coil 714 can be located in any section
730 and nested in any of condenser cooling coils 710 when condenser 700
includes a plurality of sections 730, 732. Furthermore, auxiliary cooling
capacity can be varied by changing the size of auxiliary cooling coil 714
or by changing the number of auxiliary cooling coils 714.

[0025]Referring again to FIG. 3, cooling coil 314 of the auxiliary cooling
circuit is within the V formed by condenser cooling coils 310. A V-shaped
panel spans the space between each of the legs (forming the V) of
condenser coils 310 as shown in FIG. 8. As shown, V panel is a sheet
metal structure installed to prevent air from bypassing condenser coils
310. Heated cooling fluid from the section of the cooling system that
requires auxiliary cooling or from an area of building 100 that requires
cooling is circulated through an auxiliary cooling circuit that includes
auxiliary cooling coils 314. Air drawn by fans 320 through the cabinet
passes cooling air over both condenser coils 310 and auxiliary coil 314
of the auxiliary cooling circuit, removing heat from the coils. The
cooling fluid passing through coils 314 of the auxiliary cooling circuit,
after having heat removed, may then be circulated through auxiliary
cooling coils 314, back to the area that requires auxiliary cooling. The
cooling fluid can be any fluid, and may include oil, water, or water
treated with glycol or similar additive that serves as a freezing point
depressant to lower the freezing point of water.

[0026]FIG. 9 depicts an arrangement of condenser coil 910 and auxiliary
cooling coil 914 in another variation of the present invention. The prior
embodiments depict two independent coils, one for refrigerant
condensation and the other for auxiliary cooling. Such embodiments are
readily implemented for round tube flat plate fin coils. The embodiment
in FIG. 9 is particularly suited for creating independent circuits in
multichannel tube or coil, one for condensation of refrigerant and the
other for oil cooling. The condenser coil is part of a first circuit that
circulates a first fluid, a refrigerant fluid, and the auxiliary cooling
coil is part of a second circuit that circulates a second fluid. FIG. 9
does not show the coils arranged in a cabinet with a fan, which have been
omitted for better clarity. The auxiliary cooling coil is positioned
below the condenser coil. However, the condenser coil position is not so
limited, as the circuit may be positioned in any part of the coil. In
FIG. 9, the two coils are adjacent to one another, but the circuits are
independent of one another, the fluids from the circuits entering common
manifolds to permit ingress and egress of fluids, the circuits being
separated from one another in the manifolds by dam/baffles. Hot
refrigerant enters condenser cooling coil 910 at a top inlet 952 formed
in a manifold 960, and channels through the condenser coil, exiting the
coil from an outlet 954 formed in manifold 960 below the inlet as a
cooled refrigerant. Auxiliary cooling fluid, which may be oil or glycol,
but is not so limited, enters auxiliary cooling coil 914 at an inlet 956
formed in manifold 960, and circulates through auxiliary coil 914 and
exits at an outlet 958 formed in a manifold 962. The refrigerant and
cooling fluids do not mix in manifolds 960, 962. A single manifold 960
may be utilized if desired, in which case the second fluid would enter
and exit at outlet 958 located in manifold 960. Air, drawn by a fan (not
shown), passes over the coils, removing heat by convection. Thus, the
present invention provides auxiliary cooling capacity for a cooling
system while utilizing the existing equipment and space of the condenser,
minimizing the expense. The system further provides arrangements to
increase the auxiliary cooling capacity, as needed, or to provide
independent auxiliary cooling to various areas that require independent
cooling.

[0027]It should be understood that the application is not limited to the
details or methodology set forth in the description or illustrated in the
figures. It should also be understood that the phraseology and
terminology employed herein is for the purpose of description only and
should not be regarded as limiting.

[0028]While the exemplary embodiments illustrated in the figures and
described are presently preferred, it should be understood that these
embodiments are offered by way of example only. Accordingly, the present
application is not limited to a particular embodiment, but extends to
various modifications that nevertheless fall within the scope of the
appended claims. The order or sequence of any processes or method steps
may be varied or re-sequenced according to alternative embodiments.

[0029]It is important to note that the construction and arrangement of the
systems as shown in the various exemplary embodiments is illustrative
only. Although only a few embodiments have been described in detail in
this disclosure, those skilled in the art who review this disclosure will
readily appreciate that many modifications are possible (e.g., variations
in sizes, dimensions, structures, shapes and proportions of the various
elements, values of parameters, mounting arrangements, use of materials,
colors, orientations, etc.) without materially departing from the novel
teachings and advantages of the subject matter recited in the claims. For
example, elements shown as integrally formed may be constructed of
multiple parts or elements, the position of elements may be reversed or
otherwise varied, and the nature or number of discrete elements or
positions may be altered or varied. Accordingly, all such modifications
are intended to be included within the scope of the present application.
The order or sequence of any process or method steps may be varied or
re-sequenced according to alternative embodiments. In the claims, any
means-plus-function clause is intended to cover the structures described
herein as performing the recited function and not only structural
equivalents but also equivalent structures. Other substitutions,
modifications, changes and omissions may be made in the design, operating
conditions and arrangement of the exemplary embodiments without departing
from the scope of the present application.